Cap for covering the opening ends of jars, cans, etc.



' 161s,9 Feb. 22,1927. s N'TEVANDER 3 3` CAP FOR COVERING THE OPENING ENDS` 0F JARS, CAN S ETC Filed uarch 21. 1924 n F eb. 22, p'

' jswAN NIns 'rEvnNnEia or MAYWooD, ILLINOIS.

car ron covnnING THE 'OPENING ENDS or JARS, cans, nrc.

' Application nl eamar'c'h 21, 1924.' serial No. 700,775.

My capA relates to the type of caps which are known as screwl caps that are held on tov and over the nozzles or'openings ofthe jars or cans by threaded .portionsjon the outside of the jars' and on `the margin or skirt ofthecapS.

. The object of my invention is to produce a'cap thatl will make a tight seal without the ure 1.

use of the gasket used with screw caps when seals are required.

`Reference will be had to the accompany!A ing drawing in which Figure 1 is aneleva; tion ofthe opening* end ofl a jar with my cap` applied.P f a igure 2 is avertical section through Flg- .Figure 3 is an -enlarged section 'ofa portion of the. opening'of a jar with the` caps secured thereon.

I prefer. to make my cap having a metal outside portion'lined with -paper on vthe inside'fthe paper being secured `to the metalv by a special'adhesive which has the vresult of making the paper and metal as it were a unitary composite material actlng as what i might be termeda one iece article..

In -'the drawing, 1 in icates the opening end,l nose or. nozzle of a glass jar', on the outside of which there are the threads 2. 3 indicates the outside or metal portion of my ca and 4 the paper liningof the cap. l the-manufacturefof these caps the ypaper .is aplplied' tok the metal in large sheets and suita ly treated and then. these sheets of composite material are stamped out and.

. formed with the corrugations-r threads` 5 anis the skirt of 'aus hemming and the hemming has the .effect .which are'. adapted to screw onto the threads,

2 of the jar. The lower edge of the skirt of my cap is turned over.into the hem 6 shown in the enlar d view in Fig. 3, and cap is stiiened by this of preventingI as it were, any local displacement of the paper lining: 4 from the metal on` the edgeof the cap as the cap is used frequently byjbe'ing screwed-on 'or olf and this hemmed portion is a defensagainst in- I jugto the paper lining..

on-tha'poipt for the sealing the ordinary use of screw caps for jars 1 n whlch are-carried preserves,r fruit I andfood-stuifsof various kinds the old practioeis' to use a. screw cap `having a vgasket of' some inert or non-corrosive material interposed overthe end of the nozzle hearing the contact of the threaded region of the cap. In any case the old system of screw caps relied for the'seal to be effected on the top annular surface 7. Y Y

It frequently occurs thatchanges of temperature or change in the chemical action of of thenozzle around the the contents of the jar causes a`gaseous pres- Y sure to develop on the insideof the jarand this pressure through the spring of the met-al around the region indicated by 8 and the screw threads generally results in breaking the 'seal on the surface 7 and as it were transmits tlie responsibility of the ti ht seal on portlons of the 'skirt of the capi.'

. The screw threaded skirt or flange of the cap when made of metal alonedoes not conform to the surface of the threads of the glass ofthe jar to make ati'ght seal for these threads on the jars are never exactly true as' they are distorted in themolding and-dise torted in the vit-rifying orannealing of the jars so ythat when there is pressure developed on the inside of a jar. the seal of which is made through a gasket held on' atthe surface 7 by the screw threaded cap the bulging of the .cap surface frequently breaks this seal and the contents of the jar become damaged because of the screw threaded por- ;tions of Athe cap may notv be relieduponto f furnish 'a secure seal of themselves.

j The paper'lining of my cap while i6 is not supposed to be elastic to any great extent has-the effect of making a tight closure onthe screw threads'upon the commercial jars as xordinarily used. when if the metal alone were relied on for this seal therel would be frequent cases where the seal would not be eiiccted on the screw threaded surface.

By close examination of Figure 3 it will be noticed that whenever a screw cap of any kind is screwed down firmly causing the top surface of the cap tojam tightly on to the" nozzle surface 4 there then takes place a series of small voidsindicated by 9, Fig. '3,

and any .seal that is to be effected on the screw threaded surface is supposed'to be accomplished' at the point 10. In a metal capA any slight irregularities of the fits along the port-ions 10 wo d allow. leaks through the screw threaded rtions and thus it has been found 4that Iordinary screw c aps using gas- .kets at the-top only are not to be relied upon as making a good seal in' all cases f their use and asuiicient number of them always failssothat packers do not rely on screw threaded caps with complete safety for a seal.

With my cap composed ofl a composite material like metal and paper made as described the paper is the contacting material on all surfaces where the cap touches the jar and thus a more secure, seal'is obtained in a screw threaded article than has heretofore been obtained with a direct metal Contact of the screw threaded portions of the caps.

. What I claim isz- V `1. A capv of the class'y described formedv the bent edge of the stronger material is exposed downwardly and the softer material is protected against rupture or separation from the outer layer.

2. A cap of the class described. formedof composite sheet material' having an'outer` layer of metal and an inner layer of softer material such aspaper, the cap having a` screw-threaded skirt entirely composed of the composite material with the lower edge -3'0 of the metallic outer layer bent inwardly and upwardly to embrace and enclose the lower marginal portion of thewsofter mate# rial so that only the bent edge of the metal .is exposed downwardly andthe inner layer j of softer material is protected against ruptureor separation from the outer-layer.

8. A` cap of the class described formed of composite sheet material having an outer layer of metal and an inner layer of paper 40 or the like adherent thereto, the cap havin a screw-threaded skirt embodying bot materials ,throughout with the lower ed e of the 'metal bent inwardly. and upward y to embrace and clamp the lower marginal or- 45 tion of the paper lining so that only the ent edge of. the metal Ais exposed downwardly anl the lining material is protected against ru ture or se araton from the metal.

and. ruary, 1924.

SWAN NILS TEVANDER. A

edat hicago, in the county. of Cook, 150 tate of Illinois, this 28th day iof Feb- 

